Conditions at San Juan in March
March: Spring Trade-Off: A Bit More Clean, A Bit Less Size
March is a transition month. The average swell height eases to 2-3ft (0.8m) and the period holds at 6.1s. Dominant swells now split almost evenly between E (39%) and ESE (45%), with 3-5ft (1-1.5m) energy still appearing around 20% of the time. This marks a slow shift toward the summer trade-wind regime, and the loss of north in the swell means the NNE-facing beach has to work harder to make the waves stand up.
Wind quality improves slightly: ideal conditions reach 25%, as the trades weaken in the 10-20kph range and the SE/SSE component grows. Those directions are side-shore at San Juan, but they take some of the chop off the surface. With air temperatures at 25.2°C and water at 26.3°C, the ocean is warm, and increasing rain (2.54mm/day) hints at the wet season ahead. Keep expectations in the 2-3ft range and choose the light-wind windows.
Average Spot conditions at San Juan in March
Swell history for March
Wind history for March
Swell quality
Analyze the groundswell consistency at San Juan during March. Based on historical data, there is a % probability of groundswell occurring this month. The chart below provides a detailed breakdown of the average wave height distribution, offering deep insights into the swell quality and surf potential you can expect at San Juan for your next trip in March.
Ground swell
Ground swell by size
Wind conditions
Evaluate the wind and swell alignment at San Juan for March. Our analysis shows that favorable offshore or side-shore winds coincide with surfable swell approximately % of the time. The accompanying graph illustrates the average size distribution of waves during these optimal wind windows at San Juan.